ECMAScript 是否区分大小写？

Question

I understand that JavaScript (the language that implements the spec) is case sensitive . For example, variable names:

let myVar = 1
let MyVar = 2 // different :)

I haven't been able to find anything in the spec itself that indicates that this is a requirement, so I'm not sure if that was just a design decision independent of the spec.

Answer 1

I think I found something that specifies this. Names and Keywords says:

Two IdentifierNames that are canonically equivalent according to the Unicode standard are not equal unless, after replacement of each UnicodeEscapeSequence , they are represented by the exact same sequence of code points.

Since uppercase and lowercase letters have different code points, identifiers with different case are not equal.

Answer 2

Yes it is case sensitive but generally JavaScript developers follow camel case convention.